Deana,
I don't know if prednisone making his speech worse would be an indication of its affect on him. (casting about trying to find the right wording) I wonder if the stress caused by the prednisone, as in how it is making him feel, is what is making his speech worse. Does this make sense? On the other hand,I've read that sometimes a person with MG will actually be worse at first, until the dosage is adjusted. If his speech continues to worsen, it may not be a bad thing, because its indicative that something he takes into his body can have an effect on it. But still, just wonder if its the stress of the trial, KWIM?
Keep in touch, xo